Caterpillar 226 Skid Steer Loader Electrical Issue and Machine Overview

[MikePhua]

Problem Description
Operators of the Caterpillar 226 skid steer loader occasionally encounter a specific starting and stalling issue. The machine may idle briefly but stalls when releasing the ignition key from the start to the run position. Investigation often shows no power to the fuel shut-off valve’s white wire, which is supposed to be live when the ignition is on “run.”
Checks usually involve:

• Verifying the six relays in the engine compartment; swapping them typically does not resolve the issue.
  
• Checking fuses which often remain intact.
  
• Inspecting the key switch, which can function normally.
  

Such symptoms suggest a possible electrical wiring fault beyond the relays or a relay located in an area other than the main engine compartment, which may control the fuel shut-off.
Troubleshooting Advice

• Acquire the Caterpillar 226 wiring schematic to trace the fuel shut-off wiring and pinpoint the relay responsible.
  
• Inspect wiring harnesses, connectors, and ground points carefully for damage or corrosion.
  
• Consider alternate relay locations such as inside the operator cabin or near the control panel.
  
• Check if any aftermarket security or electrical systems have been installed that could interfere.
  
• Testing the fuel shut-off solenoid directly for continuity and voltage is recommended.
  

Terminology

• Fuel Shut-Off Valve: Electrically controlled valve that stops fuel flow to the engine, preventing operation.
  
• Relay: Electromechanical switch used to control electrical circuits with a low voltage input.
  
• Ignition Key Switch: The control switch allowing power flow to start and run positions.
  
• Harness: Bundle of wires transmitting electrical signals within machinery.
  

Machine Overview
The Caterpillar 226 skid steer loader is a mid-sized, versatile machine known for:

• Engine: 2.2L Cat C2.2 CRDI, 67 hp
  
• Rated Operating Capacity: 1,550 lbs (705 kg)
  
• Operating Weight: Approximately 5,849 lbs (2,653 kg)
  
• Hydraulic System: Standard loader hydraulic pressure of about 3,336 psi with optional high-flow providing enhanced work tool performance.
  
• Cab: Offers a sealed/pressurized cab option with improved HVAC and visibility.
  
• Controls: Electro-hydraulic controls with modular lift arms that optimize lift strength and operator sight lines.
  

Service Accessibility

• Routine maintenance points such as filters, battery, and fluid fill/checks are accessible at ground level, facilitating quick service.
  

Summary
The Caterpillar 226 skid steer loader offers versatile power and advanced hydraulic controls suitable for many construction and landscaping jobs. The described starting/stalling issue relates to loss of electrical supply to the fuel shut-off valve solenoid, often caused by wiring or relay location complexities. Obtaining electrical schematics, carefully tracing circuits, and checking harness integrity are critical steps toward resolution to restore reliable machine operation.